Automatic document feeding device

Abstract

There is disclosed an automatic document feeding device provided with a positionally adjustable document detector for adjusting the document stopping position.

What I claim is: 
     
       1. An automatic feeding device comprising: transport means for transporting a sheet document to a predetermined position;   document detecting means for detecting an edge of the sheet document;   timer means for activating said transport means for a predetermined period in response to a detection by said document detecting means to transport and stop the sheet document at the predetermined position;   a manually operable input means;   control means for causing an image forming operation to be initiated after the sheet reaches the predetermined position and stops at that position;   regulating means changing the predetermined position; and prohibiting means responsive to an input from said manually operable input means for prohibiting initiation of the image forming operation under control of said control means after the sheet reaches the predetermined position and stops at that position;   wherein document feeding may be performed without an associated image forming operation.   
     
     
       2. A device according to claim 1 wherein said control means produces a start signal for causing an exposure operation to be initiated, and said prohibiting means prohibits the start signal from said control means. 
     
     
       3. A device according to claim 1 wherein said regulating means includes means for permitting movement of an attached position of said document detecting means, said determined position being regulated by the movement of the attached position of said document detecting means. 
     
     
       4. A device according to claim 1 wherein said regulating means includes means for selecting the predetermined period of said timer means, the predetermined position being regulated by the selection of the predetermined period of said timer means. 
     
     
       5. A device according to claim 4 wherein said timer means includes signal generating means for generating pulse signals in response to the operation of said transport means, and counting means for counting the pulse signals generated from said signal generating means, the predetermined period of said timer means being selected by the selection of the count number of the pulse signals.